Under the list of controls that will adjust with the device detection screen sizes and device types, the RadPanelBar is not listed. It would be handy if this control was able to automatically layout differently if there were more space. 

For example, on a wide screen monitor, the panels would be side by side, if there was room. And if the same page was viewed in a smaller screen size, the panels would stack and become collapsible as they are by default now.